Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) (Contingent Consideration, USD $) In Thousands, unless otherwise specified							6 Months Ended				6 Months Ended		6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 Income Approach Valuation Technique Fair Value, Inputs, Level 3	Jun. 30, 2014 Minimum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Jun. 30, 2014 Maximum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Jun. 30, 2014 Revenue-based Payments	Jun. 30, 2014 Revenue-based Payments Income Approach Valuation Technique Fair Value, Inputs, Level 3	Jun. 30, 2014 Other Payments	Jun. 30, 2014 Other Payments Income Approach Valuation Technique Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate							5.40%	11.00%	15.00%
Contingent consideration liability	$ 2,507	$ 2,513	$ 2,526	$ 6,692	$ 6,694	$ 6,697				$ 2,255		$ 252
Probability of milestone payment											90.00%		100.00%